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Finding the Fourth Proportional to 19,807.20, 29,643.60 and 12,021.60

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Solution

The fourth proportional to 19,807.20, 29,643.60 and 12,021.60 is: 17,991.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,807.20 : 29,643.60 = 12,021.60 : x
  2. Step 2: Convert to fraction form
    19,807.20/29,643.60 = 12,021.60/x
  3. Step 3: Cross multiply
    19,807.20x = 29,643.60 × 12,021.60
  4. Step 4: Simplify right side
    19,807.20x = 356,363,501.76
  5. Step 5: Solve for x
    x = 356,363,501.76/19,807.20
  6. Step 6: Final answer
    x = 17,991.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.